Update requirements.txt

requirements.txt

@@ -1,4 +1,5 @@
 gradio>=3.25.0
+tiktoken>=0.3.3
 requests[socks]
 transformers
 python-markdown-math
@@ -7,7 +8,6 @@ latex2mathml
 python-docx
 mdtex2html
 colorama
-tiktoken
 Markdown
 pygments
 pymupdf